package cn.cj.erp.common.http;

import cn.cj.erp.common.constants.SystemConstants;
import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.*;
import java.io.*;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;

/**
 * 通用http发送方法
 *
 * @author ruoyi
 */
@Slf4j
public class HttpUtils {

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url 发送请求的 URL
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url) {
        return sendGet(url, StrUtil.EMPTY);
    }

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        return sendGet(url, param, StandardCharsets.UTF_8.name());
    }

    /**
     * 向指定 URL 发送GET方法的请求
     *
     * @param url         发送请求的 URL
     * @param param       请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @param contentType 编码类型
     * @return 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param, String contentType) {
        StringBuilder result = new StringBuilder();
        BufferedReader in = null;
        try {
            String urlNameString = StrUtil.isNotBlank(param) ? url + "?" + param : url;
            log.info("http get request - {}", urlNameString);
            URL realUrl = new URL(urlNameString);
            URLConnection connection = realUrl.openConnection();
            connection.setRequestProperty("accept", "*/*");
            connection.setRequestProperty("connection", "Keep-Alive");
            connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            connection.connect();
            in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            log.info("http post response - {}", result);
        } catch (ConnectException e) {
            log.error("http get ConnectException, url={},param={}\n", url, param, e);
        } catch (SocketTimeoutException e) {
            log.error("http get SocketTimeoutException, url={},param={}\n", url, param, e);
        } catch (IOException e) {
            log.error("http get IOException, url={},param={}\n", url, param, e);
        } catch (Exception e) {
            log.error("http get Exception, url={},param={}\n", url, param, e);
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (Exception ex) {
                log.error("http get close Exception, url={},param={}\n", url, param, ex);
            }
        }
        return result.toString();
    }

    /**
     * 向指定 URL 发送POST方法的请求
     *
     * @param url   发送请求的 URL
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return 所代表远程资源的响应结果
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        try {
            log.info("http post request - {}", url);
            URL realUrl = new URL(url);
            URLConnection conn = realUrl.openConnection();
            setPostConnParams(conn);
            out = new PrintWriter(conn.getOutputStream());
            out.print(param);
            out.flush();
            in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
            String line;
            while ((line = in.readLine()) != null) {
                result.append(line);
            }
            log.info("http post response - {}", result);
        } catch (ConnectException e) {
            log.error("http post ConnectException, url={},param={}\n", url, param, e);
        } catch (SocketTimeoutException e) {
            log.error("http post SocketTimeoutException, url={},param={}\n", url, param, e);
        } catch (IOException e) {
            log.error("http post IOException, url={},param={}\n", url, param, e);
        } catch (Exception e) {
            log.error("http post Exception, url={},param={}\n", url, param, e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
                if (in != null) {
                    in.close();
                }
            } catch (IOException ex) {
                log.error("http post close Exception, url={},param={}\n", url, param, ex);
            }
        }
        return result.toString();
    }

    /**
     * 发送 ssl Post请求
     * @param url 连接地址
     * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
     * @return java.lang.String
     **/
    public static String sendSSLPost(String url, String param) {
        StringBuilder result = new StringBuilder();
        String urlNameString = url + "?" + param;
        try {
            log.info("http ssl post request - {}", urlNameString);
            SSLContext sc = SSLContext.getInstance("SSL");
            sc.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
            URL console = new URL(urlNameString);
            HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
            setPostConnParams(conn);
            conn.setSSLSocketFactory(sc.getSocketFactory());
            conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
            conn.connect();
            InputStream is = conn.getInputStream();
            BufferedReader br = new BufferedReader(new InputStreamReader(is));
            String ret;
            while ((ret = br.readLine()) != null) {
                if (StrUtil.isNotEmpty(ret) && !"".equals(ret.trim())) {
                    result.append(new String(ret.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8));
                }
            }
            log.info("http ssl post response:\n{}", result);
            conn.disconnect();
            br.close();
        } catch (ConnectException e) {
            log.error("http ssl post ConnectException, url=" + url + ",param=" + param, e);
        } catch (SocketTimeoutException e) {
            log.error("http ssl post SocketTimeoutException, url=" + url + ",param=" + param, e);
        } catch (IOException e) {
            log.error("http ssl post IOException, url=" + url + ",param=" + param, e);
        } catch (Exception e) {
            log.error("http ssl post Exception, url=" + url + ",param=" + param, e);
        }
        return result.toString();
    }

    /**
     * 设置post的连接参数
     * @param conn 连接
     **/
    private static void setPostConnParams(URLConnection conn) {
        conn.setRequestProperty("accept", "*/*");
        conn.setRequestProperty("connection", "Keep-Alive");
        conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
        conn.setRequestProperty("Accept-Charset", "utf-8");
        conn.setRequestProperty("contentType", "utf-8");
        conn.setDoOutput(true);
        conn.setDoInput(true);
    }

    /**
     * 信任所有证书
     */
    private static class TrustAnyTrustManager implements X509TrustManager {
        @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) {
        }

        @Override
        public X509Certificate[] getAcceptedIssuers() {
            return new X509Certificate[]{};
        }
    }

    /**
     * 不校验域名
     */
    private static class TrustAnyHostnameVerifier implements HostnameVerifier {
        @Override
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    }


}